BS 1083 - 1965 Precision Hexagon Lock Nuts - B.S.W. & B.S.F. threads


Unit: inch
Thread Size
d
1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4
PP BSW
BSF
s max
min
k max
min
e max
20 18 16 14 12 12 11 10
26 22 20 18 16 16 14 12
0.445 0.525 0.600 0.710 0.820 0.920 1.010 1.200
0.438 0.518 0.592 0.702 0.812 0.912 1.000 1.190
0.133(0.161) 0.166(0.192) 0.208(0.224) 0.250 0.291 0.333 0.375 0.458
0.123(0.151) 0.156(0.182) 0.198(0.214) 0.240 0.281 0.323 0.365 0.448
0.51 0.61 0.69 0.82 0.95 1.06 1.17 1.39
Thread Size
d
7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-3/4 2
PP BSW
BSF
s max
min
k max
min
e max
9 8 7 7 - 6 5 4.5
11 10 9 9 8 8 7 7
1.300 1.480 1.670 1.860 2.050 2.220 2.580 2.760
1.288 1.468 1.640 1.815 2.005 2.175 2.520 2.700
0.500 0.583 0.666 0.750 0.833 0.916 1.083 1.166
0.490 0.573 0.656 0.730 0.813 0.896 1.063 1.146
1.50 1.71 1.93 2.15 2.37 2.56 2.98 3.19
①,Alternative thickness values have been provided, in parentheses, for sizes 1/4 in, 5/ 16 in and 3/8 in to cater for different manufacturing processes. This option shall not apply unless the purchaser in his enquiry and order specifically sta tes which of the alterna tive thickness values he requires .
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